Source
From the release:
The public beta for Wave 2 is over and all of the cards are available for free download from our site! Wave 2 includes models from Rising Powers, Twisting Fates, and Storm of Shadows. So, if you were unable to find rules for your favorite models in the second edition book, they'll be available here.
These PDFs are final, official, and tournament legal. They are only missing the art, and arsenal decks will be on their way for wave 2 later this year. The only models missing from wave 2 are the avatars, and an open beta test for the avatars is starting this week!